How does PHP pass static classes / static methods?

how does 1.PHP pass static classes / methods?

for example:

use XXX\Other;//
class Test{

    public static function run(){
        $var_a = "test1";
        Other::send(function() use($var_a,self::verifyC){
            //....
            self::verifyC($var_a);
        });
    }
    
    public static function verifyC($var){
        //...
    }

}

Test::run();

how do you pass a reference to the self::verifyC method or the self object in code like this?

the current practice is to instantiate a self, and pass it as a variable, for example.
$self = new self () ;
how to uninstantiate the delivery?

Php
Mar.06,2021

Test::verifyC($var_a);
MySQL Query : SELECT * FROM `codeshelper`.`v9_news` WHERE status=99 AND catid='6' ORDER BY rand() LIMIT 5
MySQL Error : Disk full (/tmp/#sql-temptable-64f5-1b3757b-4ecee.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1b3757b-4ecee.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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